Question

quantos termos ten a pa (4,7, 10...157)?

Answer 1

An= A1+(n-1).r
157=4+(n-1).3
153=3n-3
n=156/3
n=52

Answer 2

n: ?
a1: 4
an: 157
R: 3

an= a1 + (n-1)r
157= 4 +( n-1)3
157= 4 + 3n - 3
157-1= 3n
156/3 = n

n= 52